package org.sky.util;

/**
 * @author weifx
 * @Title: NumberUtils
 * @ProjectName springboot-platform
 * @Description: TODO{数字工具类}
 * @date 2019/3/28 9:53
 * @Version 1.0
 */
public class NumberUtils {
    public final static String[] chineseDigits1 = new String[] { "零", "壹", "贰", "叁",
            "肆", "伍", "陆", "柒", "捌", "玖" };
    public final static String[] chineseDigits2 = new String[] { "〇", "一", "二", "三",
            "四", "五", "六", "七", "八", "九" };

    /**
     * "零", "壹", "贰", "叁","肆", "伍", "陆", "柒", "捌", "玖"
     * @param num
     * @return
     */
    public static String numToUpper1(int num) {
        String rstr = amountToChinese(num, chineseDigits1);
        return rstr;
    }

    /**
     * "〇", "一", "二", "三", "四", "五", "六", "七", "八", "九"
     * @param num
     * @return
     */
    public static String numToUpper2(int num) {
        String rstr = amountToChinese(num, chineseDigits2);
        return rstr;
    }
    /**
     * 把金额转换为汉字表示的数量，小数点后四舍五入保留两位
     * @param amount
     * @return
     */
    public static String amountToChinese(int amount, String[] cin) {
        if (amount > 99999999999999.99 || amount < -99999999999999.99)
            throw new IllegalArgumentException(
                    "参数值超出允许范围 (-99999999999999.99 ～ 99999999999999.99)！");
        boolean negative = false;
        if (amount < 0) {
            negative = true;
            amount = amount * (-1);
        }
        long temp = Math.round(amount * 100);
        int numFen = (int) (temp % 10); // 分
        temp = temp / 10;
        int numJiao = (int) (temp % 10); // 角
        temp = temp / 10;
        // temp 目前是金额的整数部分

        int[] parts = new int[20]; // 其中的元素是把原来金额整数部分分割为值在 0~9999 之间的数的各个部分
        int numParts = 0; // 记录把原来金额整数部分分割为了几个部分（每部分都在 0~9999 之间）
        for (int i = 0;; i++) {
            if (temp == 0)
                break;
            int part = (int) (temp % 10000);
            parts[i] = part;
            numParts++;
            temp = temp / 10000;
        }

        boolean beforeWanIsZero = true; // 标志“万”下面一级是不是 0

        String chineseStr = "";
        for (int i = 0; i < numParts; i++) {

            String partChinese = partTranslate(parts[i], cin);
            if (i % 2 == 0) {
                if ("".equals(partChinese))
                    beforeWanIsZero = true;
                else
                    beforeWanIsZero = false;
            }
            if (i != 0) {
                if (i % 2 == 0)
                    chineseStr = "亿" + chineseStr;
                else {
                    if ("".equals(partChinese) && !beforeWanIsZero) // 如果“万”对应的
                        // part 为
                        // 0，而“万”下面一级不为
                        // 0，则不加“万”，而加“零”
                        chineseStr = "零" + chineseStr;
                    else {
                        if (parts[i - 1] < 1000 && parts[i - 1] > 0) // 如果"万"的部分不为
                            // 0,
                            // 而"万"前面的部分小于
                            // 1000
                            // 大于 0，
                            // 则万后面应该跟“零”
                            chineseStr = "零" + chineseStr;
                        chineseStr = "万" + chineseStr;
                    }
                }
            }
            chineseStr = partChinese + chineseStr;
        }

        if ("".equals(chineseStr)) // 整数部分为 0, 则表达为"零元"
            chineseStr = cin[0];
        else if (negative) // 整数部分不为 0, 并且原金额为负数
            chineseStr = "负" + chineseStr;

        chineseStr = chineseStr + "";

        if (numFen == 0 && numJiao == 0) {
            chineseStr = chineseStr + "";
        } else if (numFen == 0) { // 0 分，角数不为 0
            chineseStr = chineseStr + "点" + cin[numJiao] + "";
        } else { // “分”数不为 0
            if (numJiao == 0) {
                chineseStr = chineseStr + "点零" + cin[numFen] + "";
            } else {// 角不为0
                chineseStr = chineseStr + "点" + cin[numJiao] + "" + cin[numFen]
                        + "";
            }
        }
        return chineseStr;
    }

    /**
     * 把一个 0~9999 之间的整数转换为汉字的字符串，如果是 0 则返回 ""
     * @param amountPart
     * @return
     */
    private static String partTranslate(int amountPart, String[] cin) {
        if (amountPart < 0 || amountPart > 10000) {
            throw new IllegalArgumentException("参数必须是大于等于 0，小于 10000 的整数！");
        }
        String[] units = new String[] { "", "拾", "佰", "仟" };
        int temp = amountPart;
        String amountStr = new Integer(amountPart).toString();
        int amountStrLength = amountStr.length();
        boolean lastIsZero = true; // 在从低位往高位循环时，记录上一位数字是不是 0
        String chineseStr = "";
        for (int i = 0; i < amountStrLength; i++) {
            if (temp == 0) // 高位已无数据
                break;
            int digit = temp % 10;
            if (digit == 0) { // 取到的数字为 0
                if (!lastIsZero) // 前一个数字不是 0，则在当前汉字串前加“零”字;
                    chineseStr = "零" + chineseStr;
                lastIsZero = true;
            } else { // 取到的数字不是 0
                chineseStr = cin[digit] + units[i] + chineseStr;
                lastIsZero = false;
            }
            temp = temp / 10;
        }
        return chineseStr;
    }
}
